#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Author: Milan Nikolic <gen2brain@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import os
import sys
import gettext
from subprocess import Popen, PIPE
from signal import SIGTERM

try:
    import gtk
    import gobject
    assert gtk.pygtk_version >= (2, 16, 0)
except ImportError, AssertionError:
    sys.stderr.write("This program needs pygtk 2.16 or higher\nExiting\n")
    sys.exit(1)

try:
    import alsaaudio as alsa
except ImportError:
    sys.stderr.write("This program needs pyalsaaudio 0.6 or higher\nExiting\n")
    sys.exit(1)

try:
    from config import Config
    import preferences
    from preferences import PREFS
    from alsactrl import AlsaControl
    from dbusservice import DBusService
    from scale import VolumeScale
    from menu import PopupMenu
    from utils import which
except ImportError:
    sys.stderr.write("Can't import application modules\nExiting\n")
    sys.exit(1)

config = Config()
gettext.bindtextdomain(config.app_name, config.locale_dir)
gettext.textdomain(config.app_name)

import __builtin__
__builtin__._ = gettext.gettext

class VolumeTray(gtk.StatusIcon):
    """ GTK+ application for controlling audio volume from system tray/notification area """

    def __init__(self):
        """ Constructor """
        gtk.StatusIcon.__init__(self)

        self.config = config
        self.preferences = preferences.Preferences(self)

        self.toggle = PREFS["toggle"]
        self.mixer = PREFS["mixer"]
        self.icon_theme = PREFS["icon_theme"]
        self.show_tooltip = bool(int(PREFS["show_tooltip"]))
        self.run_in_terminal = bool(int(PREFS["run_in_terminal"]))
        self.scale_increment = float(PREFS["scale_increment"])
        self.scale_show_value = bool(int(PREFS["scale_show_value"]))
        self.keys = bool(int(PREFS["keys"]))
        self.keys_backend = PREFS["keys_backend"]
        self.show_notify = bool(int(PREFS["show_notify"]))
        self.notify_timeout = float(PREFS["notify_timeout"])
        self.notify_position = bool(int(PREFS["notify_position"]))
        self.notify_body = PREFS["notify_body"]

        if which("pidof"):
            self.pid_app = "pidof -x"
        elif which("pgrep"):
            self.pid_app = "pgrep"

        try:
            from Xlib import X
            self.has_xlib = True
        except ImportError:
            self.has_xlib = False

        self.lock = False
        self.lockid = None
        self.notify = None
        self.key_press = False
        self.keys_events = None

        self.alsactrl = AlsaControl(PREFS)
        self.menu = PopupMenu(self)
        self.scale = VolumeScale(self)
        self.dbus = DBusService(self)

        if self.keys:
            self.init_keys_events()
        if self.show_notify:
            self.init_notify()

        self.connect("button_press_event", self.on_button_press_event)
        self.connect("scroll_event", self.on_scroll_event)
        self.connect("popup_menu", self.on_popup_menu)

        # set current volume
        self.update()

        # watch for changes
        fd, eventmask = self.alsactrl.get_descriptors()
        gobject.io_add_watch(fd, eventmask, self.update)

    def init_keys_events(self):
        """ Initialize keys events """
        if self.keys_events:
            if hasattr(self.keys_events, "stop"):
                self.keys_events.stop()
            del self.keys_events
            self.keys_events = None

        if not self.keys:
            return

        if self.keys_backend == "hal":
            try:
                from dbusevent import DBusEvent
                self.keys_events = DBusEvent(self)
            except Exception, err:
                sys.stderr.write("%s.%s: %s\n" % (
                    __name__, sys._getframe().f_code.co_name, str(err)))
                self.keys_events = None
        elif self.keys_backend == "xlib":
            if self.has_xlib:
                try:
                    from xlibevent import XlibEvent
                    self.keys_events = XlibEvent(self)
                    self.keys_events.start()
                except Exception, err:
                    sys.stderr.write("%s.%s: %s\n" % (
                        __name__, sys._getframe().f_code.co_name, str(err)))
                    self.keys_events = None
            else:
                sys.stderr.write("Xlib backend needs python-xlib 0.15rc1 or higher\n")
                self.keys_events = None

    def init_notify(self):
        """ Initialize desktop notifications """
        if self.notify:
            self.notify.close()
            del self.notify
            self.notify = None

        if self.show_notify:
            try:
                from notification import Notification
                self.notify = Notification(self)
            except Exception, err:
                sys.stderr.write("%s.%s: %s\n" % (
                    __name__, sys._getframe().f_code.co_name, str(err)))
                self.notify = None

    def on_volume_changed(self, widget=None, data=None):
        """ Callback for scale value_changed signal """
        if self.lock:
            return

        if self.lockid:
            gobject.source_remove(self.lockid)
            self.lockid = None

        self.lock = True
        volume = int(self.scale.get_value())
        self.alsactrl.set_volume(volume)
        vol = self.get_volume()

        icon = self.get_icon_name(vol)
        self.update_icon(vol, icon)
        if self.show_tooltip:
            self.update_tooltip(vol)

        if self.key_press:
            if self.show_notify and self.notify:
                self.update_notify(vol, icon)

        self.lockid = gobject.timeout_add(10, self._unlock)

    def _unlock(self):
        """ Unlock scale """
        self.lock = False
        self.lockid = None
        self.key_press = False
        return False

    def on_button_press_event(self, widget, event, data=None):
        """ Callback for button_press_event """
        if event.button == 1:
            self.scale.toggle_window()
        elif event.button == 2:
            if self.toggle == "mute":
                self.change_volume("mute")
            elif self.toggle == "mixer":
                self.menu.toggle_mixer.set_active(
                        not self.menu.toggle_mixer.get_active())

    def on_scroll_event(self, widget, event):
        """ Callback for scroll_event """
        if event.direction == gtk.gdk.SCROLL_UP:
            self.change_volume("up")
        elif event.direction == gtk.gdk.SCROLL_DOWN:
            self.change_volume("down")
        if self.show_notify and self.notify:
            self.notify.close()

    def on_popup_menu(self, status, button, time):
        """ Show popup menu """
        self.menu.toggle_mixer.handler_block(self.menu.mixer_handler_id)
        self.menu.toggle_mixer.set_active(self.mixer_get_active())
        self.menu.toggle_mixer.handler_unblock(self.menu.mixer_handler_id)

        self.menu.toggle_mute.handler_block(self.menu.mute_handler_id)
        self.menu.toggle_mute.set_active(self.alsactrl.is_muted())
        self.menu.toggle_mute.handler_unblock(self.menu.mute_handler_id)

        self.menu.popup(None, None, gtk.status_icon_position_menu, button, time, self)

    def change_volume(self, event, key_press=False):
        """ Change volume """
        self.key_press = key_press
        volume = self.scale.get_value()

        if event == "up":
            volume = min(100, volume + self.scale_increment)
        elif event == "down":
            volume = max(0, volume - self.scale_increment)

        if event == "mute":
            self.menu.toggle_mute.set_active(
                    not self.menu.toggle_mute.get_active())
        else:
            self.menu.toggle_mute.set_active(False)
            self.scale.set_value(volume)

    def get_icon_name(self, volume):
        """ Returns icon name for current volume """
        if volume == 0 or volume == _("Muted"):
            icon = "audio-volume-muted"
        elif volume <= 33:
            icon = "audio-volume-low"
        elif volume <= 66:
            icon = "audio-volume-medium"
        elif volume > 66:
            icon = "audio-volume-high"
        return icon

    def get_icon_themes(self):
        themes = ["Default"]
        icons_dir = os.path.join(config.res_dir, "icons")
        try:
            for file in os.listdir(icons_dir):
                if os.path.isdir(os.path.join(icons_dir, file)):
                    if not file.startswith("."):
                        themes.append(file)
        except OSError:
            pass
        return themes

    def get_status_info(self, volume):
        """ Returns status information """
        var = "" if volume == _("Muted") else "%"
        card_name = self.alsactrl.get_card_name()
        mixer_name = self.alsactrl.get_mixer_name()
        return var, card_name, mixer_name

    def get_volume(self):
        """ Get volume """
        if self.alsactrl.is_muted():
            return _("Muted")
        else:
            return self.alsactrl.get_volume()

    def update_icon(self, volume, icon):
        """ Update icon """
        if self.icon_theme != "Default":
            icon = os.path.abspath(os.path.join(
                    config.res_dir, "icons", self.icon_theme, "32x32", icon+".png"))
            self.set_from_file(icon)
        else:
            self.set_from_icon_name(icon)

    def update_tooltip(self, volume):
        """ Update tooltip """
        var, card_name, mixer_name = self.get_status_info(volume)
        tooltip = "<b>%s: %s%s </b>\n<small>%s: %s\n%s: %s</small>" % (
                _("Output"), volume, var, _("Card"), card_name, _("Mixer"), mixer_name)
        self.set_tooltip_markup(tooltip)

    def update_notify(self, volume, icon):
        """ Update notification """
        if self.icon_theme != "Default":
            icon = os.path.abspath(os.path.join(
                    config.res_dir, "icons", self.icon_theme, "48x48", icon+".png"))
        self.notify.show(icon, self.notify_body, self.notify_timeout, volume)

    def update(self, source=None, condition=None):
        """ Update volume """
        if self.lock:
            return True
        try:
            self.alsactrl = AlsaControl(preferences.PREFS)
            volume = self.alsactrl.get_volume()
            scale_value = self.scale.get_value()
            gtk.gdk.threads_enter()
            if volume != scale_value:
                self.scale.set_value(volume)
            else:
                self.scale.emit("value_changed")
            gtk.gdk.threads_leave()
            return True
        except Exception, err:
            sys.stderr.write("%s.%s: %s\n" % (
                __name__, sys._getframe().f_code.co_name, str(err)))
            return False

    def toggle_mixer(self, widget=None):
        """ Toggle mixer application """
        try:
            pid = self.mixer_get_pid()
            if pid:
                os.kill(pid, SIGTERM)
            else:
                if self.run_in_terminal:
                    term = os.getenv("TERM")
                    term_full = which(term)
                    if term == "rxvt" and not term_full:
                        term = "urxvt"
                        term_full = which(term)
                    cmd = [term_full, "-e", self.mixer]
                else:
                    cmd = which(self.mixer)
                Popen(cmd, shell=False)
        except Exception, err:
            sys.stderr.write("%s.%s: %s\n" % (
                __name__, sys._getframe().f_code.co_name, str(err)))

    def mixer_get_pid(self):
        """ Get process id of mixer application """
        pid = Popen(self.pid_app + " " + os.path.basename(self.mixer),
                stdout=PIPE, shell=True).communicate()[0]
        if pid:
            try:
                return int(pid)
            except ValueError:
                return None
        return None

    def mixer_get_active(self):
        """ Returns status of mixer application """
        if self.mixer_get_pid():
            return True
        return False

    def main(self):
        """ Main loop """
        gobject.threads_init()
        try:
            gtk.main()
        except KeyboardInterrupt:
            pass

    def quit(self, widget=None):
        """ Quit main loop """
        gtk.main_quit()
